Abstract
A low-complexity digital signal processing (DSP) back end is proposed for electronically scanned wideband transmit apertures using a uniform linear array (ULA) of Vivaldi antennas. The proposed approach exploits the concept of multidimensional network resonance, albeit in the transmit mode, to derive ultra-low-complexity recursive two-dimensional filters that can be used to feed in a ULA, producing steerable wideband beams. Full-wave electromagnetic simulations are used to verify the algorithm with wideband test input signals. A quantitative comparison with an equally selective fast-Fourier-transform-based wideband transmit aperture verifies an order-of-magnitude lower DSP complexity with reduced undesired sidelobes.
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